J/AJ/133/1658ivo://CDS.VizieR/J/AJ/133/1658doi:10.26093/cds/vizier.51331658CDSSarajedini A.Bedin L.R.Chaboyer B.Dotter A.Siegel M.Anderson J.,Aparicio A.King I.Majewski S.Marin-Franch A.Piotto G.Reid I.N.,Rosenberg A.2020-06-25T15:19:46Z2019-11-12T14:49:08ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frglobular-star-clustershst-photometryWe present the first results of a large Advanced Camera for Surveys (ACS) survey of Galactic globular clusters. This Hubble Space Telescope (HST) Treasury project is designed to obtain photometry with S/N (signal-to-noise ratio) >~10 for main-sequence stars with masses >~0.2M_{sun}_ in a sample of globulars using the ACS Wide Field Channel. Here we focus on clusters without previous HST imaging data. These include NGC 5466, NGC 6779, NGC 5053, NGC 6144, Palomar 2, E3, Lynga 7, Palomar 1, and NGC 6366. Our color-magnitude diagrams (CMDs) extend reliably from the horizontal branch to as much as 7 mag fainter than the main-sequence turnoff and represent the deepest CMDs published to date for these clusters. Using fiducial sequences for three standard clusters (M92, NGC 6752, and 47 Tuc) with well-known metallicities and distances, we perform main-sequence fitting on the target clusters in order to obtain estimates of their distances and reddenings. These comparisons, along with fitting the cluster main sequences to theoretical isochrones, yield ages for the target clusters. We find that the majority of the clusters have ages that are consistent with the standard clusters at their metallicities. The exceptions are E3, which appears ~2Gyr younger than 47 Tuc, and Pal 1, which could be as much as 8Gyr younger than 47 Tuc.2007AJ....133.1658Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/133/1658CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-tohttps://users.astro.ufl.edu/~ata/public_hstgc : ACS SGGC Home Pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/133/1658https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/133/1658http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/133/1658https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/133/1658https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/133/1658http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/133/1658GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/133/1658/acssggc (Catalog for the 65 clusters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/133/1658/acssggc?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/133/1658/acssggc?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/133/1658/acssggc?GETtext/xml+votable180.050000true292.2022308-30.38194740.0055555555555555566/1133 3950 9436 9666 10321 10336 10337 12405 12425 12943 14489 16647 19091 24843 27975 27981 27984 27986 28067 28705 28741 28751 28959 28972 28973 29184 30378 30769 30995 30998 31019 31115 31416 31417 33321 33330 33634 33635 34242 36971 37294 38465 39642 41257 41304 41522 41852 42076 42152 42278 42314 42320 42336 42700 42955 42958 42990 42991 43125 43227 47125 47168 47620 47777 47825 47865 47866 47868 47903 47916 47935 47971 48021 48035 48434 48444 489522.367228618189496e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/133/1658?format=asciidefaultJ/AJ/133/1658/acssggcCatalog for the 65 clustersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterClustermeta.id.parentcharSeqSequential number, within the clustermeta.recordintXposX positionpixpos.cartesian.x;instr.detdoubleYposY positionpixpos.cartesian.y;instr.detdoubleVmag? V magnitude (Vega)magphot.mag;em.opt.Vfloatnullablee_Vmag? rms uncertainty on Vmag (1)magstat.error;phot.mag;em.opt.VfloatnullableV-IV-I colour index (V-I)magphot.color;em.opt.V;em.opt.Ifloate_V-I? rms uncertainty on V-I (1)magstat.error;phot.color;em.opt.VfloatnullableImag? I magnitude (Vega)magphot.mag;em.opt.Ifloatnullablee_Imag? rms uncertainty on Imag (1)magstat.error;phot.mag;em.opt.IfloatnullableVground? Ground V magnitudemagphot.mag;em.opt.VfloatnullableIground? Ground I magnitudemagphot.mag;em.opt.Ifloatnullableo_VmagNumber of observations in Vmagmeta.numberinto_ImagNumber of observations in Imagmeta.numberintwV[1/4] where did the V mag come from (1=deep unsat, 2=short unsat)meta.codeintwI[1/4] where did the I mag come from (3=short sat, 4=deep sat)meta.codeintxsigRMS of x positions (2)stat.errorfloatysigRMS of y positions (2)stat.errorfloatothvfraction of F606W light from other starsphys.composition.massLightRatiofloatothifraction of F814W light from other starsphys.composition.massLightRatiofloatqfitVquality of the V fit (smaller is better)meta.code.qualfloatqfitIquality of the I fit (smaller is better)meta.code.qualfloatRAJ2000Rigth ascension (J2000)degpos.eq.ra;meta.mainindexedDEJ2000Declination (J2000)degpos.eq.dec;meta.mainindexedJ/AJ/133/1658/clustersCluster listrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterCluster namemeta.id.parentcharNstarsNumber of stars for this clustermeta.numberintSimbadNameSimbad column added by the CDSmeta.idchar